Paper-mill pump



May 1l 1926.

A. X. KENNEDY PAPER MILL PUMP Filed Deo. 15. 1925 5 Sheets-Sheet 1 INATNQ Mb 1K1 wnlo A. X. KENNEDY 61H01 new May 11 1926.

A. X. KENNEDY PAPER MILL `PUMP 3 Sheets-Sheet 2 Ywm 1h31. A. X. Kem/EDY FledDeC. l5. 1923 61H01 u a 14 May 11 1926. 1,583,978

l`A. x. KENNED/Y PAPER MILL PUMP Filed Dec. 15. 1923 5 Sheets-Sheet 3 3ra/manto@ AX, KENNEDY atto/Lm,

Patented May ll,- 1926. i i

UNITED STATES lPari-'mr oFFicE.

ALEXANDER X. KENNEDY, OF TYRONE, PENNSYLVANIA, ASSIGNOR T WILLIAM A.

RIDDELL, OF FREDERICK, MARYLAND.

PAPER-MILL PUMR.

Application led December 15, 1923. SerialI No. 681,000.

My invention relates broadly to the manmechanicalbeaters in the suction line; Fig. 55 ui'acture of paper and like products, and 6 is a theoretical diagram illustrating the more particularly to a pump for moving the character of feed motion imparted to the paper stock in a paper mill at the same time paper stock by my pump construction; and

that the pulp is mechanically beaten. Fig. 7 shows my invention applied to a One of the objects of my invention is to double suction paper mill pump. 60 provide a single bearing paper mill pump Heretofore in the art much diiiiculty has arranged to impart movement to the paper been experienced in handling heavy paper stock through the mill independently of stock in a paper mill. Relatively high io gravity feeding of the stock, eliminating the head of inconvenient proportions has been cntraining of air with the pulp which has a required to insure delivery of the pulp t0 65 tendency to impede the progress of the the pump. In some installations the locastock. tion of an elbow in the delivery line, neces Another object of the invention is to prosary by reason of local convenience, has

vide a paper mill pump lconstruction by caused substantial reduction in the flow of which heavy stock may be successfully the stock when using pumps having the in- 70 moved through the mill. herent limitations of those heretofore avail- A further object of the invention .is'to able. In other instances the pump has been `provide a paper mill pump with a pair of necessarily mounted in an inconvenient podriving members, one serving as an iinpelsiti'on out of normal to enable a more direct ler to centrifugally act upon the stock and feed line for the stock to the pump. How- 755 l another serving as a propeller and a meever, with all these arrangements it has chanical beater positioned at such a distance `been impossible to successfully employ very from the impeller that a constant mass of heavy paper stoc paper stock is continuously forced into they y my present, invention I am enabled eye of the impeller Without' the entraining to operate with paper stock as heavy as sev- 80 of air. en percent. I provide a pump comprising Still another object of my invention is te va casing having a singleA bearing at one side provide a single suction paper mill pump and a suction p1 e at the other side; a shaft 5o for handling relatively heavy paper stock is journaled int e bearing and extends into in which a plurality of mechanical beaters the suction pipe. An impeller is carried 86 and propellersinay be operated, in the sucby the shaft within the casing, and adjation line in combination with the impeller cent the extremity of the shaft I provide for treating the stock simultaneously with one or more propellers s aced at a predeits movement through the mill. termined distance from t e im )eller with- Other and further objects of my invenin the suctionline. Paper stoc -has many 90 tion will be understood from the specificapeculiar characteristics, among which are tion hereinafter following` by reference to the inlinitesimal size of the individual parthe accompanying drawings, in which: ticles whichxcomprise the pulp. These in- Figure l is a diagrammatic view'showing finitesimal particles are acked compactly the arrangement of my paper mill pump in' and form a semi-plastic lbody in combina- 95 a mill; Fig. 2 isa front elevation of the tion with water. The propeller in my pump pump as arranged in Fig. l, the suction pipe construction opera-testo force this mass of being broken away to show the propeller material into the eye of the im eller which and mechanical beater therein; F ig. 3 is a in turn imparts centrifugal orce to the vertical cross sectional view through my Stock for conveying it forward through the 100. pump constructiontaken on line 3-3 of mill. It often occurs that air is entrained Fig. l; Fig. 4f is a cross sectional View with the stock in such manner that the imthrough the suction pipe taken on line 4-4 peller operates only upon an air pocket and 6G of Fig. 3 showing the propeller used in my the flow of the stock ceases. The propeller pump; Fig. 5 is a side elevation partially in my construction agitates the paper stock, 105 in cross section of a modified construction subdividing the infinitesimal particles and of my paper mill pump having an outboard delivering them in a horizontal column bearlng and a plurality of propellers and equal to the distance between the propeller and the im eller, and forcing the stock into the eye of) the impeller. ,i The propeller tends to continually build up this column into a compact mass while the impeller operates to continuously reduce the length of the column as the stock moves forward. It will be observed that a column of stock of substantially constant length is continuously maintained between the impeller and the propeller, insuring constant feed.

As heretofore pointed out, a plurality of beaters and propellers may be operated in the suction line simultaneously with the rotation of the impeller, in which case the stock is positively forced into the impeller at the same time that the particles are subjected to abeating action finely subdividing the same. In this modification an outboard bearing is provided on the drive. shaft.

Referring more particularly to the drawings, the pump is shown arranged in the paper milly in Figs.l 1 and 2. Reference character 1 indicates the pump casing provided with a suction pipe 2 at one side and a single bearing 3 at the opposite side in which the pum shaft 4 is journaled and driven from a suitable pulley Y5 journaled in bearings 6 and 7. The pump. and journals are mounted on base 8. The suction pipe 2 is connected through pipe 9 with chest 10 containing the paper stock. A discharge pipe 11 is provided at the opposite end of the pump casing 1 and is arranged to convey the paper stock through pipe 12 passing up through partition 14. The stock is delivered through pipe 15 to the beater 16.

In Fig. 2 the suction pipe has been broken away to show. the propeller 17 on the shaft 4. This propeller 17 is keyed upon the shaft 4 as indicated at 18 and secured against axial movement by means of cap nut 19. An impeller 2() is keyed on shaft 4 as indicated at 21 and abuts against shoulder 22 on shaft 4. Varies 23 are carried by the impeller and arranged to discharge the paper stock into the pump casing 1. The propeller and the impeller are spaced apart on shaft 4 by meansof a sleeve 24 at such a distance that a column is provided in which the paper stock is continuously built up by the operation of propeller 17 while impeller 20 tends to continuously diminish the column of pa er stock within vthe area indicated by re erence character 25. The suction pipe 2 is provided with a removable hand hole cover 26 adjacent the propeller to enable repairs to be readily made. The casting comprising the suction-pipe 2 is continued in a vertical plane forming a wall 27 of the pump casing, the opposite wall of which is completed by casting 28 which supports the single bearing for the pump.

In Fig. 5 I have represented an extension shaft 29 coupled to shaft 4 by means of coupling 30. This shaft is supported in an outboard bearing 31 and may pass through elbow 3,2. The pipe section 33 is interposed between the suction pipe 2 and the elbow 32. Positionedat p-redetermined intervals along the shaft section 29 I may provide propellers 34, 35, 36, and 37 with bafiies 38, 39, and. 40 positioned in staggered relationship therebetween.

Referring to the theoretical diagram shown in Fig. 6 of the drawings, it will be observed that the heavy paper stock 41 moves through the suctiolr pipe in a compact mass by virtue of the beating action iin-- parted to the stock by the propeller which operates to finely divide the stock and push the same forward into a compact column 42 whichis substantially the distance between the propeller and the impeller. The impeller operates to draw the stock forward as indicated at 43 and 44 and diminish the length of the column 42 at a rate proportional to -the speed at which the propeller tends to build up the column 42. By this continuous beating action the air pockets in the stock are avoided, for the material is well agitated, and a very heavy stock may be moved forward through the mill.`

In Fig. 7 I have shown an application of my invention to double suction pumps. The shaft 4 is journaled at 45 and 46 passing through packing 47 and 48 into pump casing 1. The im cller 20 is centrally mounted on shaft 4in t e pump casing 1 and a propeller 17 and 49 provided at each side thereof in each of the suction pipes. These propellers operate to build up a column of paper pulp on each side .of the impeller -as heretofore explained in connection with the single bearing construction.

While I have described my invention in certain particular embodiments, it is to be understood that modifications may be made and that I intend no limitations upon the mvention other than are imposed by the scope of the appended claims,

What I claim and desire to secure by Letters Patent of the United States is as follows: l

1. In a system for forcing paper stock through a paper mill, the combination with a paper mill of a casing, a rotatable shaft, a single bearing in one side of said casing for said shaft, a suction pipe in the opposite side of said casing, an impeller carried by said shaft within said casing, a combined propeller and paper mill pulp beater carried by said shaft adjacent its extremity,

said combined propeller-and paper pulp beater being spaced from said impeller in such manner lthat paper stock is formed in a compact column between said impeller` and said propeller, said column being continuously diminished at one end by peller at a rate proportional to t ie speed at which it is built up at the kother end by operation of said propeller whereby said paper stock is continuously moved through the mill. A

2. A system for forcing .paper stock through a paper mill, comprising in combination with a paper mill a casing, a rotatable shaft, a journal in one end of said casing for said shaft, a suction pipe extending into the other end of said casing, an impeller carried by said shaft within said casing, and a combined propeller and paper pulp beater .mounted adjacent the extremity of said shaft 1n said suction pipe at a distance spaced from said impeller whereby the paper stock is beaten by said propeller and delivered in compact form to said impeller upon rotation of said shaft and passed through the mill.

3. In a system for handling paper stock, the combination with a paper mill of a rotary shaft, a pump casing, a single bearing for said shaft in one end of said casing, a suction pipe in the opposite end of said casing, an impeller carried by said shaft within said casing, and paper pulp beat'er pro eller `mounted adjacent the extremity of sai shaft `within said suction pipe and spaced from said impeller in such manner that paper stock is simultaneously pushed and pulled through the mill with the particles thereof finely divided land the air excluded'therefrom by operation of said propeller prior to their passage through said impeller whereby a constant ow of paper stock through said mill is secured.

4. A system forI forcing paper stock through a paper mill comprising in combination with a suction pipe a drive shaft extending therein, a centrifugal pump, an impeller for said centrifugal pump positioned directly upon `said drive shaft and a propeller mounted on said drive shaft in spaced relation to the eye of said impeller for agitating and beating the. stock, liberating air therefrom, rendering it of uniform consistency and simultaneously driving it in to the eye of the impeller of the pump.

5. The method of treating paper stock which consists in advancing the said stock filir through a conduit, simultaneously beating 60 the stock in the said conduit to finely' divide the particles thereof and exclude air pockets therefrom, thereafter forming the finely divided particles into a compact mass, and

driving it into the eye of the impeller of a centrifugal pump.

In testimony whereof I affix my si ALEXANDER ature.

X. KEN N DY. 

